Base



FIG. 1 is a perspective view of a base showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a side view thereof; the opposite side being identicalthereto;

FIG. 4 is a top plan view thereof; and,

FIG. 5 is a bottom plan view thereof.

The ornamental design for a base, as shown and described. 